JP2000000522A - Method for preventing adhesion of fat and oil to surface having fine roughness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and easily prevent adhesion of oils and fats such as finger prints to the surface having fine roughness without requiring a costly apparatus. SOLUTION: This method for preventing adhesion of oils and fats to the surface having fine roughness is carried out by applying a solution containing polyperhydrosilazane to the surface having fine roughness and then curing the polyperhydrosilazane. The surface having fine roughness is the matt-finished surface or a hairline-processed surface. The polyperhydrosilazane entering the recesses parts of the surface is converted into a cured product by drying and curing treatment to prevent adhesion of fats and oils for a long duration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing fats and oils from adhering to a surface having fine irregularities, and more particularly, to a fingerprint or the like on a surface having fine irregularities such as a surface having a satin pattern or a hairline pattern. The present invention relates to a method for preventing adhesion of fats and oils.

[0002]

2. Description of the Related Art We manufacture metals, glass, ceramics,
They live surrounded by products made from many materials such as plastic. And for that product,
It has been required to have not only excellent functions but also excellent appearance.

[0003] In general, materials for manufacturing various products are often provided in a glossy state.
In order to impart a more aesthetically rich and luxurious appearance, the surface of these materials is made into a satin pattern by sandblasting or the like (pattern processing) or a hairline pattern is applied by polishing or the like (hairline processing) to eliminate gloss. That is often done. For example, metals such as titanium and stainless steel are often used for wristwatch bands, cameras, headphone stereos, interior building materials, etc., but adding a satin pattern or hairline pattern to these metal surfaces to increase their added value Is often done.

[0004] Fine irregularities are formed on the surface on which the above-mentioned satin pattern or hairline pattern is processed, and when touched by hand, the fats and oils of the hand tend to adhere to the surface. And, for example, fats and oils attached to the convex portion of the satin pattern are removed by wiping, but oils and fats attached to the concave portions cannot be easily removed,
As a result of remaining as a fingerprint, there is a problem that the surface appearance is impaired.

As a method for solving such a problem, silica (Si) is applied to the surface such as
A method has been proposed in which O ₂ ) is vapor-deposited and a concave portion on the surface is filled with silica to prevent fingerprints from being attached. However,
The vacuum vapor deposition method has a disadvantage that the apparatus itself is expensive and the vapor deposition cost is high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and does not require an expensive device, and is capable of easily adhering a fat or oil such as a fingerprint to a surface having fine irregularities. It is an object of the present invention to provide a method for preventing such a problem.

[0007]

Means for Solving the Problems The present inventor has been diligently studying means for preventing the adhesion of fats and oils on a surface having fine irregularities, and found that the cured product of polyperhydrosilazane can effectively remove the surface. The present inventors have found that since the recesses can be filled and the physical properties are strong, the adhesion of fats and oils can be prevented for a long period of time, and the present invention has been completed.

That is, the present invention provides a method for applying a solution containing polyperhydrosilazane to a surface having fine irregularities and then curing the solution to form a cured product. It is intended to provide a method for preventing the attachment of fats and oils.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the method of the present invention, a solution containing polyperhydrosilazane is applied to a surface on which fine irregularities such as a satin pattern or a hairline pattern are formed, and a polyperhydrosilazane film is formed. May be formed, and then this film may be cured by means such as heating.

An example of the polyperhydrosilazane used in the present invention is represented by the following general formula:

Embedded image (Wherein R ¹ , R ² and R ³ are each independently a hydrogen atom; a group in which a group bonding to silicon or nitrogen such as an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group is carbon; an alkylsilyl group; An alkylamino group or an alkoxy group, provided that at least one of R ¹ , R ² and R ³ is a hydrogen atom) and a number average molecular weight of 100 to 50,000 And polyperhydrosilazane compounds.

In the present invention, as the polyperhydrosilazane, for example, a silicon alkoxide-added polyperhydrosilazane obtained by heating and reacting the above-mentioned polyperhydrosilazane compound with a silicon alkoxide (Japanese Unexamined Patent Publication No.
Glycidol-added polyperhydrosilazane obtained by heating and reacting the above-mentioned polyperhydrosilazane compound with glycidol (JP-A-6-122).
852), an alcohol-added polyperhydrosilazane obtained by heating and reacting the above-mentioned polyperhydrosilazane compound and alcohol (Japanese Patent Laid-Open No. 6-240208),
Metal carboxylate / polyperhydrosilazane (JP-A-6-299118) obtained by reacting a metal carboxylate containing titanium, platinum, rhodium, etc., and the above polyperhydrosilazane compound and acetylacetonato complex (metal Acetylacetonato complex-added polyperhydrosilazane obtained by heating and reacting Ni, Pt, Pd, Al, Rh, etc. (Japanese Patent Application Laid-Open No. 6-306329).
And other polyperhydrosilazane derivatives.

In addition, other polyperhydrosilazane derivatives can also be used.

The polyperhydrosilazane used in the present invention is preferably a polyperhydrosilazane having a number average molecular weight of 300 to 5,000, more preferably a number average molecular weight of 1,000 to 1,400.

The above-mentioned polyperhydrosilazane is a liquid or a solid having different viscosities depending on the molecular weight and the molecular structure. Therefore, in general, hydrocarbon solvents such as xylene (m-xylene or o-xylene), cyclohexane and cyclohexene are used. It is preferably handled as a polyperhydrosilazane solution appropriately diluted with various organic solvents such as ether solvents such as dibutyl ether.

The amount of the organic solvent for diluting the polyperhydrosilazane is not particularly limited, and may be appropriately determined according to the coating method, the desired amount of the cured product, and the like. Needless to say, when the polyperhydrosilazane is a low viscosity liquid, it can be handled as a polyperhydrosilazane solution as it is.

The method of the present invention can be used without particular limitations on the shape, material, etc., of an article (object to be treated) having fine irregularities on the surface. Examples of the shape of the object to be processed include many shapes such as a plate, a rod, and a cylinder, and examples of the material of the object to be processed include metal, glass, ceramics, and plastic. be able to.

Next, a method for forming a cured product according to the method of the present invention will be described. First, it is preferable to clean the surface of the object before applying the polyperhydrosilazane solution to the surface of the object. In this cleaning treatment, the object to be treated is degreased with a commercially available neutral detergent, or degreased with a commercially available alkaline electrolytic degreasing agent, and then washed with pure water or the like.
It may be dried at 0 to 100 ° C. for 20 to 60 minutes, or may be washed with an organic solvent such as alcohol or xylene.

Next, a polyperhydrosilazane solution is applied to the surface of the object to be treated. There is no particular limitation on the application method, and a conventionally used method such as dipping, brushing, spraying or the like is applied to the shape of the object. Can be appropriately selected according to the size.

In the case of application by immersion or brush coating, the amount of application increases depending on the application conditions, and when a cured product is formed, gloss may appear on the surface with a reduced gloss such as a satin pattern. . Considering this,
The spray method is preferable, for example, when applied to a surface having a matte pattern by a spray method, most of the polyperhydrosilazane solution adheres to the concave portions of the matte pattern, and the amount of the polyperhydrosilazane attached to the convex portions is extremely small. The gloss as described above does not appear.

Finally, it is dried and cured. Drying may be performed at room temperature to 120 ° C. for 10 to 60 minutes. Curing treatment conditions can be appropriately selected according to the material of the object to be treated. For example, it may be left in air at room temperature for 1 to 3 days, or may be fired in air at 100 to 450 ° C for 1 to 3 hours, or in humid air at 90 to 120 ° C for 3 hours.
It may be heated for up to 5 hours.

The polyperhydrosilazane, most of which has adhered to the concave portions of the surface having fine irregularities, is oxidized by firing in air, hydrolyzed by heating in humid air, or oxidized and hydrolyzed by standing at room temperature. To form a dense ceramic of Si-O-based or Si-NO-based. This ceramic has excellent corrosion resistance, heat resistance, and abrasion resistance, and has high adhesion to the surface of the object to be treated, so that it has an effect of preventing fats and oils from adhering for a long period of time.

[0022]

The present invention will be described below with reference to examples.
The present invention is not limited to these embodiments and the like.

Example 1 A watch band made of titanium, the surface of which was satin-finished by a conventional method, was degreased with a commercially available alkaline electrolytic degreasing agent, washed with pure water, and dried at 80 ° C. for 1 hour. Next, spray coating was performed by a two-fluid method. That is, from one of the two-fluid nozzles, 10% by weight of polyperhydrosilazane (N-L110 manufactured by Tonen, number average molecular weight 120) was used.
M) -xylene solution containing 0) at a liquid volume of about 10 ml / min.
The watch band was spray-coated with nitrogen from the other nozzle at a pressure of 3 kgf / cm ² for 3 seconds. Next, at 120 ° C
For 1 hour and further heated at 95 ° C. for 3 hours in humid air. The band was touched by hand and left for 1 hour with the fingerprint attached. Thereafter, no fingerprint was attached to the surface after wiping with a cloth.

Comparative Example 1 The same watch band as that used in Example 1 was touched without any surface treatment by hand, left for 1 hour, and wiped with a cloth. The attached fingerprint was not easily wiped off.

[0025]

According to the method of the present invention, it is possible to effectively prevent the adhesion of oils and fats such as fingerprints to the surface having fine irregularities without requiring an expensive apparatus. The cured film formed by the method of the present invention is excellent in corrosion resistance, heat resistance, abrasion resistance, and has high adhesion to the surface of the object to be treated, so that it has an effect of preventing fats and oils from adhering for a long period of time. is there.

Therefore, the method of the present invention is a highly practical method for preventing fats and oils from adhering to an article having a satin pattern or a hairline pattern in order to impart a solid feeling and elegance. that's all

Claims (3)

[Claims] 1. A method for preventing oil and fat from adhering to a surface having fine irregularities, which comprises applying a solution containing polyperhydrosilazane to a surface having fine irregularities and then curing the solution. 2. The method according to claim 1, wherein the surface having fine irregularities is a surface subjected to satin finish or hairline finish. 3. The method according to claim 1, wherein the application is performed by a spray method.